Superheater.



' '1. PRIMROSE.

SUPERHEATER. APPLICATION FILEDIOCT. 28. 19-14.

Patented 0m. 26, 1915.

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JOHN PRIMROSE, or DONGAN HILLS, NEW YORK,

' SUPERHEATER.

Specification of Letters Patent.

Patented oet. 2 ,1915.

Application filed October 28, 1914. sci-mine. 868,944.

To all whom it may concern Be it known that I, JOHN PRIMRosE, a subject of the King of Great Britain, re-

' siding at Dongan Hills, county of Richject matter of the present application for Letters Patent is an improvement in steam superhcaters, particularly for vertical Water tube boilers of the ordinary type. It has been the common practice for a long period in the installation of superheaters in boilers of this general form to place the s'uperheater back of the first'bank of tubes, as the space there provided is not only convenient and accessible for the purpose, but afiords the best conditions for superheating' the steam.

The specific type of superheater used in this location may be, and in practice has been,

Widely varied, and most, if not all, known forms have been used indifferently, among these the Niklaussesuperheater supported by its ends in the walls of the furnace structure, and the inverted U-tube type, suptilt ported either by its header in the same walls, or by straps or hangers depending from the beams which are used for supports for the boiler drums in constructions of this char-- acter.

i I have endeavored to improve upon the constructions heretofore used and to produce a simpler form of superheater that may be supported within its alloted space more economically and eifectively than heretofore which, in connection with the novel bafiiing arrangement, will yield a better result in its output of superheated steam than the usual forms by providing a novel method of diverting the gases in passing over the same. This baffiing is so arranged that the extreme heat of the furnace does not come in direct contact with the headers forming a part of the superheater. I

According to my present invention I install the superheater in what would ordinarily be the second pass of the boiler, but by virtue of the'specific bafiling ,the super legs or sets of tubes expanded into a longitudinal header or tubeextending across the furnace and expanding or spreading in the form of a letter V. This superheater is'supported by its legs or tubes, preferably byexpanding the ends of the two sets directly into an upper header which is supported by means of beams which, in boilers of this type, are used as supports for the drums.

From the above it will be apparent that one feature of my invention specifically .stated, consists in providing a superheater between the first and second banks of boiler tubes, and a baflie for'the first bank of tubes stopped off at an intermediate point and having a portion continued up at the rear of the superheater whereby the furnace gases after leaving the first bank of tubes are deflected among the superheater units and among the boiler tubes of the second bank.

In the drawing hereto annexed I have illustrated so much of an ordinary boiler setting and the superheater above described as is necessary to an understanding of my invention. The figure shown in this drawing 1s a vertlcal sectional view of the 1nven-' tion illustrating all of the essential parts thereof.

The boiler proper is of any ordinary type, generally characterized by upper drums 1, connected with alower drum 2 by substantially vertical banks of tubes 3, 4 and 5.

In such bgilers there are usually placed baffie platesfi and 7 to deflect the gases and confine their action to the banks of water tubes, and steel or iron beams 8 (only one' being shown in. the drawing), extending transversely across the boiler setting to furnish supports for the upper drums. I have not illustrated herein the usual chairs interv mediate to these beams and the drums as these are usually placed outside the walls heating units and the upper header are lo- I cated in the first pass of the boiler and the lower header is located in the second pass which I employ is preferably of ll-shape,

that is to say,-composed of double series of of the setting.

The superheater is composed of sets of tubes "9 and 10 united at their lower ends to a transverse saturated steam header 11 connected, by means of the pipe 12, directly with one or more of the steamdrums 1 and such joints and headers from the direct current of mcandescent gases.

One of the 1mportant features of my invention relates to the construction of a continued up at the rear of the same, as

indicated at 15. This exposes all of the superheater surfaceuniformly to the gases and at the same time forces the gases, without the use of a shelf battle or other means, into the second bank of-boiler tubes. ,In boilers of this type, without a super-heater, it is customary to provide what is known as shelf bafiles running at right angles through the battle on the first bank of .tubes at a point a little above the lower superheater header and extending over substantially to the second bank of boiler tubes for the purpose of diverting the gases and causing them to flow among the tubes of the second bank. lVhere superheaters are installed in boilers of this type this shelf battle has had to be abandoned and the superheater headers. when arranged at the bottom of the superheater, takes the place of this battle to a certain extent. The arrangement, how- .ever. of baffling which I have described herein and shown in the annexed drawing is better than is possible with the ordinary arrangement of super-heater and is even superior to the shelf battle for the purpose of forcing. the gases among the tubes of the second bank. I

Other modifications and forms will be understood without specific description or. illustration. For instance, it is quite obvious that the specific form of superheater shown and described is subject to innumerable modifications Without in any way dewiating from the true scope of my inventiont' The same is true as regards the specific form of. connection shown and described between the boiler drums and the superheater headers. stood that the specific form of my invention shown herein is merely for illustrative and descriptive purposes only and that I do not limit myself in any way except by the limiof said super-heater, and a battle foithe first bank of tubes thereih stopped off at the level of the top of the lower or inlet superheater It willtherefore be underheader and carried to the back of the same and continued up at the rear of the superheater.

2. The combination with a boiler of the usual type; of a bafile for the first bank of tubes otl'set at an intermediate portion and continued upwardly fromthe offset to deflect the gases from the first pass among the tubes of the second pass; and a superheater comprising upper and lower headers and super-heating units connecting said header,

each of said units consisting of two portions bent at substantially right angles to each other to attord access to the superheater and to permit freedom of expansion of said superheater. the lower or inlet header located in the second pass of the boiler, and the outlet header and superheating unit-s located between the upwardly continued portion of the ballle and the first bank of water tubes.

3. The combination with a boiler having a plurality of banks of tubes therein, of a super-heater loca ed between the first and second banks 0. tubes therein comprising two horizontal headers and superheating tubes connecting said headers, one of said headers being arranged above thesuperheating tubes and the other of which is arranged below'the superheating'tubes, one of said headers being an inlet to and the other an outlet from the superheater tubes, said superheating tubes consisting of two rows transversely arranged with respect to the flow of furnace'gases through the boiler and provided with horizontal portions extending laterally from bothsides of the upper header, whereby access between the two rows of superheating tubes is afforded and freedom from rigid resistance to expand by heat is permitted.

4. The combination with a boiler having a plurality of banks of water tubes therein, of a superheater located between the first and second banks of tubes comprising horizontally arranged inlet and outlet headers, and two vertical rows of superheating tubes transversely arranged in said boiler and connecting the lower header at the top and each row provided with horizontal portions connected to the upper header at the 0pposite sides thereof. whereby access is afforded between the two rows of tubes,and freedom of expansion of saidtubes is permitted.

5. The combination with a boiler having a plurality of banks of water tubes therein, of a superheater located between two of said banks comprising horizontally arranged inlet and outlet headers; and two rows of superheating elements transversely arranged in said boiler, each of said elements consisting of two portions arranged at substantially right angles to each other with the lower portion connected to the lower header and the upper portion connected to the upper header.

let and outlet headers, and a row of superheating elements transversely arranged in said boiler, each of said elements consisting of two portions arranged at substantially right arigles to each other to afiord access to V the sunerheater and to permit freedom of ex-- pension of the elements, one of said portions connected to the lower header and theotherr to the upper header.

7. The combination with a boiler having a plurality of banks oftubes therein, of a superheater located between the first and second banks of tubes therein comprising two horizontal. headers and superheating tubes connecting said headers, one of said ttt headers being arranged above the superheating tubes and the other of which is arranged below the superheating tubes, one of said headers being'an inlet to and the other an outlet from the superheating tubes, said sliperheating tubes being transversely arranged with respect to the flow of furnace gases to the boiler and provided with horimental portions connected to and extending laterally from one of said headers, whereby access to the superheater is afforded and freedom from rigid resistance to expand by heat is pennitted.

In testimony whereof I afix my signature in 'the presence of two subscribing Witnesses.

JOHN PRU/[ROSE "jWitnesses: I a

' f I -rare Penn, 7 D. H; Ganmntm. 

